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Subsidence repair minus the disruption
| 题名： | Subsidence repair minus the disruption |
| 正文语种： | eng |
| 摘要： | What is the big news from Geobear at the moment? We have recently completed two carbon studies that compare traditional techniques of subsidence repair with ours. For the recent studies, we compared our work on the railways and a domestic property. For the railway study, we were working on a level crossing, which needed to be re-levelled because it was suffering severe subsidence. Our technique is a geopolymer injection. For the railway work, it involved drilling a Umm diameter hole through the concrete slabs that form the level crossing. We drill them on an approximately one-metre spaced grid pattern and we then insert a 12mm diameter steel tube to just the underside of the slab. This is attached to our injection gun, which connects to the pumps on our injection unit. We start injecting the expansive geopolymer underneath the slab. That raises the slab and re-levels it and it also strengthens the sub-grade material below the slab. Without doing that the ride quality for the train becomes unacceptable. The train is getting too much deflection on the rails and this particular level crossing had a class 2 track fault, which means it would have to close because it was unsafe to operate. |
| 出版年： | 2022 |
| 期刊名称： | Highways |
| 卷： | 91 |
| 期： | 3 |
| 页码： | 44-45 |
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